[turbofan] Machine operators are globally shared singletons.

src/compiler/js-generic-lowering.cc

Index: src/compiler/js-generic-lowering.cc
diff --git a/src/compiler/js-generic-lowering.cc b/src/compiler/js-generic-lowering.cc
index 5631e6983093fd464a0124cf25f6fe0c3763c2e4..ea84818e60f0cf93a2da3ebe992e122d9db8a359 100644
--- a/src/compiler/js-generic-lowering.cc
+++ b/src/compiler/js-generic-lowering.cc
@@ -490,7 +490,8 @@ Node* JSGenericLowering::LowerJSStoreContext(Node* node) {
   }
   node->ReplaceInput(2, NodeProperties::GetValueInput(node, 1));
   node->ReplaceInput(1, Int32Constant(Context::SlotOffset(access.index())));
-  PatchOperator(node, machine()->Store(kMachAnyTagged, kFullWriteBarrier));
+  PatchOperator(node, machine()->Store(StoreRepresentation(kMachAnyTagged,
+                                                           kFullWriteBarrier)));
   return node;
 }